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Finding the Fourth Proportional to 1,047.38, 1,570.14 and 398.56

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Solution

The fourth proportional to 1,047.38, 1,570.14 and 398.56 is: 597.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,047.38 : 1,570.14 = 398.56 : x
  2. Step 2: Convert to fraction form
    1,047.38/1,570.14 = 398.56/x
  3. Step 3: Cross multiply
    1,047.38x = 1,570.14 × 398.56
  4. Step 4: Simplify right side
    1,047.38x = 625,795.00
  5. Step 5: Solve for x
    x = 625,795.00/1,047.38
  6. Step 6: Final answer
    x = 597.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.